Process for the production of shot effects, not to be stained in piece dyeing



Patented Apr. 310, i923.

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RICHARD HAYNN A1\TD FERDINAND M'U'NZ, OF FECHENHEIM-ON-THE-MAIN, GERMANY,

ASSIGNORS TO LEOPOLD CASSELLA & CO. GESELLSCHAFT MIT BESCHRANKTER' HAF'IUNG, A CORPORATION OIT GERMANY.

raocnss FOR THE PRODUCTION on SHOT EFFECTS, NOT TO BE STAINED IN PIECE DYEING.

No Drawing.

T all whom it may concern Be it known that we, RICHARD HAYNN, a subject of the German Republic, residing at Fechenheim-on-the-Ma-in, Germany, \Vald- 5 strasse 13, and FERDINAND Mr'iNZ, a subject of the Austrian Republic, residing at Fechenheim-on-the-Main, Germany, Haingrabenstrasse 10, have invented a certain new and useful Process for the Production of Shot Effects, Not to be Stained in Piece Dyeing, of which the following is a full description.

Various methods of preparing animal or vegetable fibres in such a manner that they do not absorb dyestuff in piece-dyeing, have already been recommended. These methods, however, have certain drawbacks; either the fibres are impaired or the resistance against staining is unsatisfactory. Among the materials recommended for preparing cotton acetic anhydride has been named. For preparing wool and other animal fibres for shotifi'ects acetic anhydride has not been used so We have now found that by a simple treatment with acetic anhydride with the addition of a catalyzer animal fibres undergo such a change as to become suitable for shoteflects. A small addition of a weak base exerts a favorable influence. In preparing eifects already dyed, an aftertreatment with chromium salts has been found useful.

EwampZe.-'Woolen yarn, previously dyed Application filed May 6, 1922. Serial No. 559,061.

after a treatment of some duration rinse and, treat for hour with 3% chromium fluoride, reckoned on the weight of the wool; finally rinse and dry.

Other anhydrides of organic acids may take the place of acetic anhydride and other catalyzers that of sulphuric acid.

Having thus described our invention what. we claim as new and desire to secure by Let ters Patent is as follows: I

1. A process for the production of shotefi'ects not to be stained in piece-dyeing, by treating animal fibres in a mixture of acetic anhydride and glacial acetic acid with the addition of catalyzers.

2. The process described in claim 1 with the use of sulphuric acid as'a catalyzer.

In witness whereof we have hereunto signed our names this 13th day of April, 1922.

RICHARD HAYNN.. FERDINAND MUNZ.

I Witnesses:

BASIL E. SAVARG, THOS. H. ANDERSON. 

